Tamperproof cap



FIG. 1 is a top plan view of a tamperproof cap showing my new design;

FIG. 2 is an inverted bottom perspective view thereof;

FIG. 3 is a top perspective view thereof;

FIG. 4 is a front elevational view thereof, the rear being identical;

FIG. 5 is a side elevational view thereof, the opposite side being identical; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a tamperproof cap, as shown and described. 